I'm not going around counting, but pretty sure we have 4 dvd players, one of them is an Oppo so it's universal, and one dedicated cd player. I can say with surety none of the dvd players have been used in 5-6 years. The cdp hasn't been used quite a while either.

2 USB Apple Super drives (one given to me as it only seems to work on my MacBook Air)1 cheap DVD player on my low priority AV system

All together they get used maybe 5 times a year.

Used to have a Sony XA-20ES CDP, but sold it after it spent years in the box and I have two Macs connected to my audio system with 4 external HDs for backup (2 are always rotated in and out of the safety deposit box).

My method has to do with sampling. There needs to be a way to measure the quality of a recording on the fly. If I over-sample a recording it can become sterile (stripped of harmonics) but depending on the recording it may need to be sampled 1 to several/times, I do this by ear, to do it on the fly needs some kind of recording measurement system so the dac knows when its good enough. Some recordings are garbage and can't be improved. Streaming sites the recordings I can assume are of reasonably good quality.

First generation Sanyo. long goneSecond generation cheap Sony. Long gonePhilipps 880. nice died. Long goneSony 89ES changer lasted a long time. finally died. Wish I had ten of them.Adcom DA600 DAC and Rotel disc spinnerSony SCD777ES put Rotel to shame, but sold Rotel anyway.Still own the slower than molasses in January SCD777ESYou can take a nap before it finishes loading a disc.Bought used Adcom DA700 Loved it for many years until got Marantz to do DAC duties.Half dozen five disc changers use one of all the time to DAC only two currently functioning fully(I fix one when I need to)Another two Sony CD9 changers.Sony SCD333 drawer stuck too lazy to see why.Sony SCD555 not working Denon 5910 DVDDenon 3910 DVDTechnics DVD-AMarantz SA-10 just bought this month.